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Introduction to Linux - A Hands on Guide

This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.

Where can I get some good Linux CAD/CAM software for creating 3D cad and writing CNC codes which can be transmitted over ethernet / RS 232 to a machine centre?
Something equivalent to "MasterCAM" on windoze would do.
Tom

If you want 'free as in beer' - not too sure. QCad by itself is free and open. If you want tools for CAM the same people offer up CAMexpert http://www.qcad.org/index.php3?product=cxp It's a commercial package, but compared to the price we paid for similar software only ten years ago you could pay for it with the change you find in the sofa.

I trust you already have the machines wired up for receipt of the code - i'd hate to see a 'G' replaced with an 'M' due to severe line noise. If noise is a problem you can always use a 20mA current loop and convert to plain old serial on the ends for serial. Or give that IBM spec cable (...forget the name now) twisted pair with shielding - for ethernet.